http://www.washingtonsblog.com/2009/06/real-holocaust-deniers-are-those-who.html

A reader named Patrick made a very insightful comment about the propaganda effort to link 9/11 truth activists with holocaust deniers (edited for readability):

Glenn Beck - while no more than a good telepromt reader - as opposed to reporter or commentator, made some disturbing parallels to the 9/11 truth movement and a crazed gunman. Nothing could be further from the truth. I have found, in my experience, that 9/11 truth members are polite, courteous, and friendly. They want nothing more than a criminal investigation of the events of 9/11.

Beck labels many as unpatriotic for not going along with the status quo. As if our government can do no wrong. It goes along with the notion that no one needs to be blamed for anything.

A form of bias that is, in fact, most common is uncritical patriotism, which leads people to believe that their political leaders never knowingly do anything terribly evil. One example is the fact that although credible reports about the genocide against Jews being perpetrated by the Nazis were circulating within Germany in the 40s, many Germans refused to believe the stories, holding that the leaders of their highly civilized nation could not commit such atrocities. Indeed, these Germans were the original ‘Holocaust deniers’.

In the 9/11 case, it is alleged that a national government committed a heinous crime; in the other case, the claim that a national government committed a heinous crime is denied. The true parallel with Americans who accuse the Bush administration of complicity in the 9/11 attacks is, therefore, with those German citizens who accused the Nazi leaders of conspiring to commit genocide. And the true parallel with the original Holocaust deniers would be with those Americans who deny their government’s responsibility for 9/11.

See this and this.